Ruhi book series, by Ruhi Institute (1987). Published volumes of the Ruhi Institute books, in PDF. (Links to documents, offsite.) [about]

Ruhi Institutes and the Five-Year Plan, by Universal House of Justice (2011). Letter to all National Spiritual Assemblies about the role of the Ruhi Institute, coordination of clusters, education of children, and training institutes in the 2011-2016 5-Year Plan. [about]